RAD Data comm Vmux-210 Specifications Page 32

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Chapter 1 Introduction Installation and Operation Manual
1-14 Functional Description Vmux-210 Ver. 1.1
Each VLAN tag contains a Priority field. The Ethernet switch in the Vmux-110
decides the transmission priority of a packet based on this field.
A packet whose VLAN ID appears in the VLAN table will
exit
(egress) the switch
based on the policy in the VLAN table (see next section).
VLAN Table
Vmux-210 includes a VLAN table, which can contain up to 64 entries, in which
packet egress policies are defined for different VLAN ids. A policy for a certain
VLAN ID determines which ports will transmit packets tagged with this ID, how
the ports will transmit them (tagged/untagged), and which ports will discard
packets tagged with this ID.
DHCP Client Support
To facilitate integration of a new device into a DHCP IP network, if the DHCP
client is enabled, but no IP address has been manually configured, Vmux-210 will
automatically request one from the DHCP server upon booting. Once an address
has been assigned by the DHCP server, it will be saved in the database. In order
to request a new address, the current one must be deleted (0.0.0.0).
Calculating Approximate Bandwidth Utilization
The following formula is used to calculate the approximate bandwidth utilization:
[(Header size x packets per second ) + (# timeslots x size of
compressed G.732 packet x 1000/30 x actual transmission time (%
non-silence) )] x 8 bytes per bit
1000 bits per kilobit
rate
converted
to kbps
}{
+
A Vmux Bandwidth Calculator tool is included on the Technical Documentation CD.
Bandwidth Utilization when using TDMoIP
By using TDMoIP multiplexing and the voice activity detection, Vmux-210 supports
a higher number of voice channels over TDM than it is possible by utilizing
conventional compression methods alone. TDMoIP multiplexing and grouping the
timeslots of compressed voice together into bundles with a common IP address
reduces the actual bandwidth used per channel to as low as 4 kbps (up to 16:1),
when all channels are active. Better compression, up to 20:1, is achieved when
some of the voice channels are idle.
The actual compression achieved at any time depends on the voice activity on the
network, the signaling system in use, and the number of modem/fax calls.
Note
Note
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